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Use of cmc in drilling fluids

Title: Use of cmc in drilling fluids.
Abstract: The invention relates to a water-based drilling fluid composition comprising a carboxymethyl cellulose (CMC), wherein the CMC is characterized by forming a gel at 25° C. after high-shear dissolution in a 0.3 wt % aqueous sodium chloride solution, the final content of the CMC in the aqueous sodium chloride solution being I wt % for a CMC having a degree of polymerization of >4,000, 1.5. wt % for a CMC having a DP of >3,000-4,000, 2 wt % for a CMC having a DD of 1,500-3,000, and 4 wt % for a CMC having a DP of <1,500, the gel being a fluid having a storage modulus (G′) which exceeds the loss modulus (G″) over the entire frequency region of 0.01-10 Hz when measured on an oscillatory rheometer operating at a strain of 0.2. ...

- Dobbs Ferry, NY, US
Inventor: Peter Marten Van Der Horst
USPTO Applicaton #: #20070135311 - Class: $ApplicationNatlClass (USPTO) -

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Related Patent Categories: Earth Boring, Well Treating, And Oil Field Chemistry, Earth Boring, Contains Organic Component, Organic Component Is Carbohydrate Or Derivative Thereof (e.g., Sugar Or Gum, Such As Galactomannan, Xanthan, Etc.) Or Carboxylic Acid Ester Of An Alcohol Which Has Five Or More Hydroxy Groups Bonded Directly To Carbons
The Patent Description & Claims data below is from USPTO Patent Application 20070135311, Use of cmc in drilling fluids.

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stats Patent Info
Application #
US 20070135311 A1
Publish Date
Document #
File Date
Other USPTO Classes
International Class

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Sodium Chlorid
Sodium Chloride

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